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RemoveDuplicatesfromSortedArray.java ( File view )

  • By issaczr 2014-10-24
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			// Author:   Li Long, 1988lilong@163.com
// Date:     Apr 17, 2014
// Source:   http://oj.leetcode.com/problems/remove-duplicates-from-sorted-array/
// Analysis: http://blog.csdn.net/lilong_dream/article/details/19757047

// Given a sorted array, 
// remove the duplicates in place such that each element appear only once and return the new length.
// Do not allocate extra space for another array, you must do this in place with constant memory.
// For example,
// Given input array A = [1,1,2], 
// Your function should return length = 2, and A is now [1,2]. 

public class RemoveDuplicatesfromSortedArray {

    public int removeDuplicates(int[] A) {

    	if(A.length == 0) {

    		return 0;
    	
}
    	if(A.length == 1) {

    		return 1;
    	
}
    	
        int index = 0;
        for(int i = 1; i < A.length; ++i) {

        	if(A[i] != A[index]) {

        		++index;
        		A[index] = A[i];
        	
}
        
}
        
        return index + 1;
    
}
    
    public static void main(String[] args) {

    	RemoveDuplicatesfromSortedArray slt = new RemoveDuplicatesfromSortedArray();
    	int[] A = {
1, 1, 2, 3, 4, 4, 5
};
    	int len = slt.removeDuplicates(A);
    	System.out.println(len);
    	for(int i = 0; i < len; ++i) {

    		System.out.print(A[i] + " ");
    	
}
    
}

}

			
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